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Retirement Benefits (Amounts recognized in other comprehensive (income) loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 30, 2022 | Dec. 31, 2021
Pension Benefits |  |
Amounts recognized in other comprehensive (income) loss |  |
Net gain (loss) arising during the period | $ 11,189 | $ 42,039
Amortization of net (gain) loss | 4,701 | 9,248
Prior service credit (cost) arising during the period | 267 | 1,458
Settlement (gain) loss | 0 | 12,285
Amortization of prior service (credit) cost | 84 | 246
Total | 16,241 | 65,276
Postretirement Medical Benefits |  |
Amounts recognized in other comprehensive (income) loss |  |
Net gain (loss) arising during the period | 9,044 | 2,391
Amortization of net (gain) loss | 345 | 1,002
Prior service credit (cost) arising during the period | 0 | 0
Settlement (gain) loss | 0 | 0
Amortization of prior service (credit) cost | 0 | 0
Total | $ 9,389 | $ 3,393

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